Application of modal flexibility and its derivatives in structural identification
Application of modal flexibility and its derivatives in structural identification
复制标题
DOI：
10.1007/pl00003899
复制
发表时间：
1998-01-01
影响因子：
1.4
通讯作者：
Aktan, AE
中科院分区：
文献类型：
--
作者：
Zhang, Z;Aktan, AE
使用错误的测试数据可能会在无损评估实践中产生误导。本文的目的是讨论使用模态测试时使用哪些实验数据以及如何减少实验误差。本文分析了模态柔度及其导数、均匀载荷面（ULS）的截断效应和对实验误差的敏感性。发现 ULS 的截断效应要小得多，并且对实验误差最不敏感。这些特点使其成为无损评价所需结构识别的关键实验指标。本文还讨论了如何利用预测试分析来确定截断误差最小的测试频段。本文提出的方法的最终有用之处在于它可以实现有效且准确的无损评估。通过数值示例和实际结构（俄亥俄州辛辛那提地区的越野公路大桥）分析了截断效应。
Using erroneous test data can be misleading in nondestructive evaluation practice. The objective of this paper is to discuss what experimental data to use and how to mitigate experimental error when a modal test is used. In this paper, the modal flexibility and its derivative, uniform load surface (ULS) are analyzed for their truncation effect and sensitivity to experimental error. The ULS is found to have much less truncation effect and is least sensitive to experimental error. These features make it a critical experimental index in the structural identification as needed in nondestructive evaluation. This paper also discusses how to utilize pretest analysis to determine the test frequency band that will lead to the least truncation error. The ultimate usefulness of the approach presented in this paper is that it can lead to effective and accurate nondestructive evaluation. A numerical example and a real structure, the Cross-Country Highway Bridge in the Cincinnati, Ohio, area, are analyzed for the truncation effect.